WO2012157068A1 - ワイヤ放電加工装置 - Google Patents
ワイヤ放電加工装置 Download PDFInfo
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- WO2012157068A1 WO2012157068A1 PCT/JP2011/061235 JP2011061235W WO2012157068A1 WO 2012157068 A1 WO2012157068 A1 WO 2012157068A1 JP 2011061235 W JP2011061235 W JP 2011061235W WO 2012157068 A1 WO2012157068 A1 WO 2012157068A1
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23H—WORKING OF METAL BY THE ACTION OF A HIGH CONCENTRATION OF ELECTRIC CURRENT ON A WORKPIECE USING AN ELECTRODE WHICH TAKES THE PLACE OF A TOOL; SUCH WORKING COMBINED WITH OTHER FORMS OF WORKING OF METAL
- B23H7/00—Processes or apparatus applicable to both electrical discharge machining and electrochemical machining
- B23H7/02—Wire-cutting
- B23H7/08—Wire electrodes
- B23H7/10—Supporting, winding or electrical connection of wire-electrode
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23H—WORKING OF METAL BY THE ACTION OF A HIGH CONCENTRATION OF ELECTRIC CURRENT ON A WORKPIECE USING AN ELECTRODE WHICH TAKES THE PLACE OF A TOOL; SUCH WORKING COMBINED WITH OTHER FORMS OF WORKING OF METAL
- B23H7/00—Processes or apparatus applicable to both electrical discharge machining and electrochemical machining
- B23H7/02—Wire-cutting
- B23H7/04—Apparatus for supplying current to working gap; Electric circuits specially adapted therefor
Definitions
- the present invention relates to a wire electric discharge machining apparatus capable of detecting disconnection of a wire electrode.
- the machining conditions are adjusted so that the machining energy is increased as much as possible in order to improve the machining speed.
- the wire electrode is easily broken.
- the wire is easily broken when processing a shape in which the processing is likely to be unstable.
- wire breakage is inherent in wire electric discharge machining devices, such as wire running becomes unstable due to aging of wire running system elements, making wire breakage easier.
- the wire electric discharge machining apparatus always needs a disconnection detecting means.
- Patent Document 1 discloses a method for detecting a wire breakage from a difference in rotational speed between two rotating elements arranged on a wire travel path.
- a wire supply bobbin around which a wire electrode is wound a tension roller that tensions the wire electrode fed out from the bobbin, a recovery roller that runs the wire electrode at a predetermined speed, and stabilization of the wire electrode running It is also possible to detect disconnection without malfunction by detecting the rotational speed of any two of the guide pulleys that change the traveling direction and detecting the disconnection when the difference between the rotational speeds of the two positions exceeds a predetermined threshold.
- the tension motor works to maintain the rotational speed even after the wire is disconnected.
- the wire breakage cannot be detected without causing a speed difference in the rotating elements at the location, or the wire breakage detection is delayed for a long time until the rotation speed difference occurs.
- the present invention has been made in view of the above, and without erroneous detection even when the wire traveling speed changes transiently or when a speed difference occurs in the rotating elements of the wire traveling system.
- An object of the present invention is to obtain a wire electric discharge machining apparatus capable of detecting appropriate wire breakage.
- the present invention provides a wire electrode, a wire supply unit that supplies the wire electrode, a recovery motor that recovers the wire electrode at a predetermined speed, and the wire supply
- a tension motor that controls the tension of the wire electrode between a portion and the recovery motor, a speed calculation means that calculates a traveling speed of the wire electrode at predetermined time intervals, and the speed calculation means that is calculated by the speed calculation means
- Speed storage means for storing travel speed; differential speed calculation means for calculating a differential speed between the current travel speed output from the speed calculation means and the past travel speed stored in the speed storage means;
- a disconnection detecting means for detecting disconnection of the wire electrode by comparing the differential speed with a predetermined threshold value is provided.
- the wire breakage is not erroneously detected, and the speed fluctuation of the tension motor is reduced. Even when the suppression control is applied, the wire breakage can be detected immediately.
- FIG. 1 is a diagram showing a configuration of a wire electric discharge machining apparatus according to Embodiment 1 of the present invention.
- FIG. 2 is a diagram illustrating a temporal change in the rotational speed of the tension motor before and after the wire breakage.
- FIG. 3 is a diagram illustrating a state in which when the rotational speed of the tension motor before and after the wire breakage is sampled, the sudden deceleration width before and after the wire breakage is sampled small depending on the sampling timing.
- FIG. 4 is a diagram showing a configuration of a wire electric discharge machining apparatus according to Embodiment 2 of the present invention.
- FIG. 1 is a diagram showing a configuration of a wire electric discharge machining apparatus according to Embodiment 1 of the present invention.
- FIG. 2 is a diagram illustrating a temporal change in the rotational speed of the tension motor before and after the wire breakage.
- FIG. 3 is a diagram illustrating a state in which when the rotational speed of the tension motor before and after
- FIG. 5 is a diagram illustrating a temporal change in the rotational speed of the tension motor before and after the wire breakage when the wire breakage is applied while the speed fluctuation suppression control of the tension motor is applied.
- FIG. 6 is a diagram showing a configuration of a wire electric discharge machining apparatus according to Embodiment 3 of the present invention.
- FIG. 1 is a diagram showing the overall configuration of a wire electric discharge machining apparatus 100 according to Embodiment 1 of the present invention.
- the wire electric discharge machining apparatus 100 includes a wire electrode 1, a wire bobbin 3 (wire supply unit) that supplies the wire electrode 1, and wire guide rollers 4, 5, 6, 7 arranged on a path along which the wire electrode 1 travels.
- the wire electric discharge machining apparatus 100 includes a speed calculation unit 18 that calculates a rotation speed, that is, a traveling speed of the wire electrode 1 from a signal of the encoder 14 attached to the tension motor 13, and a speed calculation unit 18.
- a speed storage means 19 for storing the speed calculated by the above, a differential speed calculation means 20 for calculating a differential speed from the current speed output from the speed calculation means 18 and a past sample speed output from the speed storage means 19;
- the disconnection detection threshold value setting means 21 for setting the disconnection detection threshold value, and the disconnection detection threshold value set by the disconnection detection threshold value setting means 21 and the differential speed output from the differential speed calculation means 20 are compared to determine the disconnection of the wire electrode 1.
- a disconnection detecting means 22 for detecting.
- the wire electrode 1 is fed out so as to face the workpiece 2 while being controlled to a predetermined tension and traveling speed.
- a pulse voltage is applied to the wire electrode 1 from a machining power source (not shown), and the relative distance between the wire electrode 1 and the workpiece 2 is appropriately controlled by a driving device (not shown), whereby the wire electrode 1 and the workpiece are processed.
- Discharge sparks are generated between the objects 2 one after another, and the processing proceeds.
- the traveling speed and tension of the wire electrode 1 are controlled as follows.
- the wire electrode 1 passes through the wire guide rollers 4, 5, 6, 7, and 10 from the wire bobbin 3 and is recovered by the recovery rollers 11a and 11b.
- the collection rollers 11 a and 11 b are driven by a collection motor 12.
- the traveling speed of the wire electrode 1 is determined by the processing conditions, the numerical control means 17 sends a speed command to the speed control means 15, and the speed control means 15 controls the speed of the recovery motor 12.
- the wire electrode 1 is pressed by the pinch rollers 8 a and 8 b so as not to slip between the tension roller 9, and the torque generated by the tension motor 13 is transmitted to the wire electrode 1 via the tension roller 9.
- the tension of the wire electrode 1 is determined by the processing conditions.
- a tension command is sent from the numerical control means 17 to the servo amplifier 16, and the servo amplifier 16 controls the torque of the tension motor 13 so as to obtain a predetermined tension.
- the tension motor 13 may be speed controlled, for example, when the wire electrode 1 is automatically connected or cut, the tension motor 13 is generally provided with an encoder 14, and the servo amplifier 16 controls the speed. Sometimes it is done.
- the wire electrode 1 being processed is recovered at a constant speed by the recovery rollers 11a and 11b in a state where tension is applied between the tension roller 9 and the recovery rollers 11a and 11b.
- the wire electrode 1 on the collection rollers 11a and 11b side from the break point is collected at a constant speed by the collection rollers 11a and 11b, whereas the wire electrode 1 on the tension roller 9 side is collected from the break point. Since it is no longer collected by the roller, the wire travel speed decreases.
- FIG. 2 is a diagram showing the change over time of the rotational speed of the tension motor 13 (tensile motor rotational speed). Therefore, wire disconnection can be detected by paying attention to rapid deceleration of the tension motor rotation speed. Since this sudden deceleration occurs simultaneously with the wire breakage, the wire breakage detection method focusing on sudden deceleration can immediately detect the wire breakage.
- the rapid deceleration of the tension motor rotation speed is caused by whether or not both ends of the wire electrode 1 are supported.
- the rotational speed may pulsate when the rotational speed of the tension motor 13 changes transiently, such as when the wire travel is started, when the wire is stopped, or when the wire travel speed is changed. Since the state of being supported is not changed, a rapid deceleration of the rotation speed does not occur. Therefore, in the disconnection detection method that focuses on rapid deceleration of the rotational speed, no erroneous detection is performed even while the rotational speed of the tension motor changes transiently.
- the encoder 14 measures the rotation amount of the tension motor 13 during wire travel, and the speed calculation means 18 converts the rotation amount measured by the encoder 14 into a rotation speed and sends it to the speed storage means 19 and the differential speed calculation means 20.
- the differential speed calculation means 20 calculates the differential speed from the tension motor rotation speeds of the current sample and the previous sample and sends them to the disconnection detection means 22.
- the differential speed width detected as a wire disconnection by the disconnection detection threshold setting means 21 is set as a disconnection detection threshold.
- the disconnection detection means 22 determines that the disconnection has occurred, and sends a disconnection detection signal to the numerical control means 17.
- the numerical control means 17 sends a command to stop the rotation of the tension motor 13 to the servo amplifier 16 when the disconnection detection signal is received.
- the numerical control means 17 also sends a stop command to a machining power source (not shown) and a driving device that controls the relative distance between the wire electrode 1 and the workpiece 2.
- the sample speed sent from the speed storage means 19 to the differential speed calculation means 20 is a sample speed two samples or more before.
- the rapid deceleration of the speed before and after the wire disconnection is a very short time phenomenon, but depending on the timing of the speed sampling, there is a possibility that the rapid deceleration width immediately after the wire disconnection is sampled small as in the example shown in FIG. Therefore, the differential speed is calculated from the current sample speed and the sample speed two or more samples before, thereby avoiding that the rapid deceleration width is sampled smaller than the actual fluctuation width.
- FIG. FIG. 4 is a diagram showing the overall configuration of the wire electric discharge machining apparatus 200 according to Embodiment 2 of the present invention. Further effects can be obtained by the disconnection detection method using the wire electric discharge machining apparatus 200 of the present embodiment.
- the configuration of the wire electrical discharge machining apparatus 200 in FIG. 4 is obtained by adding a moving average speed calculation means 23, a speed fluctuation calculation means 24, and a speed fluctuation suppression means 25 to the configuration of the wire electrical discharge machining apparatus 100 in FIG.
- the functions and operations of the other components in FIG. 4 are the same as those described with reference to FIG.
- the moving average speed calculating means 23 calculates the moving average speed from the rotational speed of the tension motor 13 calculated by the speed calculating means 18 and sends it to the speed fluctuation calculating means 24.
- the speed calculation means 24 calculates the speed fluctuation (AC component of speed) of the tension motor 13 from the difference between the rotational speed of the tension motor 13 given from the speed calculation means 18 and the movement average speed given from the moving average speed calculation means 23. ) Is calculated and sent to the speed fluctuation suppressing means 25.
- the speed fluctuation suppressing means 25 sends a control command for suppressing the speed fluctuation of the tension motor 13 to the servo amplifier 16, and the servo amplifier 16 controls the tension motor 13 so as to suppress the speed fluctuation in addition to the torque control.
- the tension fluctuation generated in the wire electrode 1 can be suppressed.
- the tension motor 13 can operate at a speed before the disconnection after the wire is disconnected. Try to maintain. For this reason, there is a problem that the wire breakage cannot be detected without causing a speed difference between the two rotating elements on the wire travel path, or that the wire breakage detection is delayed for a long time before the rotation speed difference occurs.
- the rotational speed of the tension motor 13 rapidly decelerates at the moment when the wire is disconnected as shown in FIG. 5, the disconnection can be detected immediately from the differential speed of the tension motor 13.
- FIG. FIG. 6 is a diagram showing the overall configuration of a wire electric discharge machining apparatus 300 according to Embodiment 3 of the present invention.
- the speed of the collection motor 12 is controlled by the speed control unit 15, but in the third embodiment, the collection is controlled by torque as shown in FIG. 6 instead of the collection motor 12 of FIG. 1.
- the speed is controlled by changing to the servo motor 13a shown in FIG.
- the speed control means 15 controls the torque of the recovery motor 12a
- the servo amplifier 16 controls the speed of the servo motor 13a.
- an encoder 14 is attached to the collection motor 12a, and the amount of rotation of the collection motor 12a is measured.
- the speed calculation means 18 converts the rotation amount measured by the encoder 14 into a rotation speed and sends it to the speed storage means 19 and the differential speed calculation means 20.
- Other components and operations are the same as those in the first embodiment. Also in the wire electric discharge machining apparatus 300 of the present embodiment, it is possible to implement a disconnection detection method that has the same effect as the above embodiment.
- the wire electrode 1 on the collection rollers 11a and 11b side from the disconnection point becomes a free end at the disconnection point. Rapidly accelerate in the direction to collect 1. Therefore, wire breakage can be detected by detecting sudden acceleration of the recovery motor 12a.
- the recovery motor 12a in FIG. 6 is also a motor that controls the tension of the wire electrode 1, and in other words can be called a tension motor. Therefore, the configurations of the first embodiment (FIG. 1), the second embodiment (FIG. 4), and the third embodiment (FIG. 6) both detect wire breakage due to a rapid speed fluctuation of the tension motor.
- the tension motor 13 (recovery motor 12a) is used at the start of wire travel, when the wire is stopped, when the wire travel speed is changed. Even when the rotation speed of the motor changes transiently, disconnection is not erroneously detected. Further, even if a speed difference is generated in the rotating element of the wire traveling system during the wire traveling due to the elongation of the wire electrode 1, the disconnection is not erroneously detected. Further, in the second embodiment, the disconnection can be detected even when the control for suppressing the speed fluctuation of the tension motor 13 is applied. Since a rapid speed change is detected simultaneously with the wire breakage, the wire breakage can be detected immediately.
- the present invention is not limited to the above-described embodiment, and various modifications can be made without departing from the scope of the invention in the implementation stage. Further, the above embodiments include inventions at various stages, and various inventions can be extracted by appropriately combining a plurality of disclosed constituent requirements.
- the wire electric discharge machining apparatus is useful for detecting the disconnection of the wire electrode, and in particular, when the wire traveling speed is transiently changed or there is a speed difference in the rotating element of the wire traveling system. It is suitable for a wire electric discharge machining apparatus capable of appropriate detection even when it occurs.
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Abstract
Description
図1は本発明の実施の形態1に係るワイヤ放電加工装置100の装置全体の構成を示す図である。ワイヤ放電加工装置100は、ワイヤ電極1と、ワイヤ電極1を供給するワイヤボビン3(ワイヤ供給部)と、ワイヤ電極1が走行する経路上に配されるワイヤガイドローラ4、5、6、7、10と、ワイヤ電極1を所定の速度で回収する回収ローラ11aと11bと、回収ローラ11aを駆動する回収モータ12と、回収モータ12の回転速度を制御する速度制御手段15と、ワイヤ電極1の張力を張架する張力ローラ9とピンチローラ8a、8b、張力ローラ9を駆動する張力モータ13と、張力モータ13に取り付けられたエンコーダ14と、張力モータ13を制御するサーボアンプ16と、速度制御手段15およびサーボアンプ16を上位で制御する数値制御(NC)手段17と、を備える。
図4は本発明の実施の形態2に係るワイヤ放電加工装置200の装置全体の構成を示す図である。本実施の形態のワイヤ放電加工装置200を用いた断線検出方式によってさらなる効果を奏することが可能となる。図4のワイヤ放電加工装置200の構成は、図1のワイヤ放電加工装置100の構成に移動平均速度算出手段23、速度変動算出手段24、速度変動抑制手段25を加えたものである。図4の他の構成要素の機能および動作は実施の形態1にて図1について説明したのと同様であるので説明を省略する。
図6は本発明の実施の形態3に係るワイヤ放電加工装置300の装置全体の構成を示す図である。実施の形態1では、回収モータ12を速度制御手段15により速度制御するとして説明したが、実施の形態3においては、図1の回収モータ12の代わりに図6に示すようにトルク制御される回収モータ12aに変更し、図1の張力モータ13の代わりに図6に示すサーボモータ13aに変更して速度制御する構成とする。
2 被加工物
3 ワイヤボビン(ワイヤ供給部)
4、5、6、7、10 ワイヤガイドローラ
8a、8b ピンチローラ
11a、11b 回収ローラ
12、12a 回収モータ
13 張力モータ
13a サーボモータ
14 エンコーダ
15 速度制御手段
16 サーボアンプ
17 数値制御(NC)手段
18 速度算出手段
19 速度記憶手段
20 差分速度算出手段
21 断線検出閾値設定手段
22 断線検出手段
23 移動平均速度算出手段
24 速度変動算出手段
25 速度変動抑制手段
100、200、300 ワイヤ放電加工装置
Claims (5)
- ワイヤ電極と、
前記ワイヤ電極を供給するワイヤ供給部と、
前記ワイヤ電極を所定の速度で回収する回収モータと、
前記ワイヤ供給部と前記回収モータとの間にて前記ワイヤ電極の張力を制御する張力モータと、
前記ワイヤ電極の走行速度を所定の時間間隔で算出する速度算出手段と、
前記速度算出手段により算出された前記走行速度を記憶する速度記憶手段と、
前記速度算出手段から出力される現在の前記走行速度と前記速度記憶手段に記憶された過去の前記走行速度との差分速度を算出する差分速度算出手段と、
前記差分速度と所定の閾値とを比較することにより前記ワイヤ電極の断線を検出する断線検出手段と、
を備えることを特徴とするワイヤ放電加工装置。 - 前記速度算出手段が算出した前記走行速度から速度変動を算出する速度変動算出手段と、
前記速度変動に基づいて前記張力モータを制御することにより前記速度変動を抑制する速度変動抑制手段と、
をさらに備えることを特徴とする請求項1に記載のワイヤ放電加工装置。 - 前記速度算出手段は、前記張力モータの回転速度に基づいて前記ワイヤ電極の走行速度を算出する
ことを特徴とする請求項1または2記載のワイヤ放電加工装置。 - 前記速度算出手段は、前記回収モータの回転速度に基づいて前記ワイヤ電極の走行速度を算出する
ことを特徴とする請求項1または2記載のワイヤ放電加工装置。 - 前記差分速度算出手段は、前記所定の時間間隔で2サンプル以上離れた前記走行速度に基づいて前記差分速度を算出する
ことを特徴とする請求項1~4のいずれか1項に記載のワイヤ放電加工装置。
Priority Applications (5)
Application Number | Priority Date | Filing Date | Title |
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DE112011105256.1T DE112011105256B4 (de) | 2011-05-16 | 2011-05-16 | Drahterodierbearbeitungsvorrichtung |
PCT/JP2011/061235 WO2012157068A1 (ja) | 2011-05-16 | 2011-05-16 | ワイヤ放電加工装置 |
JP2011541424A JP5005116B1 (ja) | 2011-05-16 | 2011-05-16 | ワイヤ放電加工装置 |
CN201180070374.5A CN103501947B (zh) | 2011-05-16 | 2011-05-16 | 线电极放电加工装置 |
US13/980,748 US9010673B2 (en) | 2011-05-16 | 2011-05-16 | Wire electric discharge machining apparatus |
Applications Claiming Priority (1)
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PCT/JP2011/061235 WO2012157068A1 (ja) | 2011-05-16 | 2011-05-16 | ワイヤ放電加工装置 |
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US (1) | US9010673B2 (ja) |
JP (1) | JP5005116B1 (ja) |
CN (1) | CN103501947B (ja) |
DE (1) | DE112011105256B4 (ja) |
WO (1) | WO2012157068A1 (ja) |
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CN103406615A (zh) * | 2013-08-21 | 2013-11-27 | 苏州市合昌电器有限公司 | 钣金加工装置 |
WO2021153430A1 (ja) * | 2020-01-28 | 2021-08-05 | ファナック株式会社 | ワイヤ放電加工機の制御装置および推定方法 |
WO2022181368A1 (ja) * | 2021-02-26 | 2022-09-01 | ファナック株式会社 | 断線位置推定装置および断線位置推定方法 |
JP7492077B2 (ja) | 2021-02-26 | 2024-05-28 | ファナック株式会社 | 断線位置推定装置および断線位置推定方法 |
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DE112015001760B4 (de) * | 2015-10-30 | 2023-08-10 | Mitsubishi Electric Corporation | Drahterodiermaschine, Steuerungsverfahren einer Steuerung einer Drahterodiermaschine und Positionierungsverfahren |
CN108436203B (zh) * | 2018-04-28 | 2019-10-22 | 南通伊阳精密机械有限公司 | 自适应线切割脉冲电源及监测该电源的伺服跟踪控制装置 |
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- 2011-05-16 US US13/980,748 patent/US9010673B2/en not_active Expired - Fee Related
- 2011-05-16 DE DE112011105256.1T patent/DE112011105256B4/de not_active Expired - Fee Related
- 2011-05-16 JP JP2011541424A patent/JP5005116B1/ja not_active Expired - Fee Related
- 2011-05-16 CN CN201180070374.5A patent/CN103501947B/zh not_active Expired - Fee Related
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Cited By (5)
Publication number | Priority date | Publication date | Assignee | Title |
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CN103406615A (zh) * | 2013-08-21 | 2013-11-27 | 苏州市合昌电器有限公司 | 钣金加工装置 |
WO2021153430A1 (ja) * | 2020-01-28 | 2021-08-05 | ファナック株式会社 | ワイヤ放電加工機の制御装置および推定方法 |
JP7335363B2 (ja) | 2020-01-28 | 2023-08-29 | ファナック株式会社 | ワイヤ放電加工機の制御装置および推定方法 |
WO2022181368A1 (ja) * | 2021-02-26 | 2022-09-01 | ファナック株式会社 | 断線位置推定装置および断線位置推定方法 |
JP7492077B2 (ja) | 2021-02-26 | 2024-05-28 | ファナック株式会社 | 断線位置推定装置および断線位置推定方法 |
Also Published As
Publication number | Publication date |
---|---|
DE112011105256B4 (de) | 2015-02-19 |
DE112011105256T5 (de) | 2014-02-27 |
CN103501947B (zh) | 2016-05-18 |
US20130292506A1 (en) | 2013-11-07 |
JP5005116B1 (ja) | 2012-08-22 |
US9010673B2 (en) | 2015-04-21 |
JPWO2012157068A1 (ja) | 2014-07-31 |
CN103501947A (zh) | 2014-01-08 |
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